Our products' performance scales with price increase. NEO iDSD and micro iDSD Signature are similar in this regard so you should expect similar quality level.
Not only this, all our DACs lean towards richness and a touch of warmth more than detailing and lighter profile in general. That's our "house" sound, which you should hear with NEO iDSD and micro iDSD Signature. The difference between them thus narrows down to different usage scenarios and functionalities. The iDSD has more powerful headphone amp and is a transportable do-it-all type of a product, whereas NEO iDSD is a streamlined desktop device with wireless input and fully balanced circuit. Hopefully this clarifies their differences
A lot.
Shortly we should have NEO iDSD added to our headphone calculator found here:
https://ifi-audio.com/home/headphone-calculator/